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Loans and allowance for credit losses - Credit Quality of Loan Portfolio by Year of Origination (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | $ 1,517,481 |  |  |
2019 | 1,246,239 |  |  |
2018 | 853,371 |  |  |
2017 | 696,494 |  |  |
2016 | 648,821 |  |  |
Prior | 900,082 |  |  |
Revolving Loans Amortized Cost Basis | 1,220,471 |  |  |
Loans | 7,082,959 | $ 4,409,642 | $ 4,409,642 | $ 3,667,511
Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 1,497,137 |  |  |
2019 | 1,211,412 |  |  |
2018 | 773,545 |  |  |
2017 | 600,634 |  |  |
2016 | 589,607 |  |  |
Prior | 764,683 |  |  |
Revolving Loans Amortized Cost Basis | 1,149,198 |  |  |
Loans | 6,586,216 |  | 4,143,116 |
Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 16,627 |  |  |
2019 | 24,396 |  |  |
2018 | 56,256 |  |  |
2017 | 78,586 |  |  |
2016 | 47,801 |  |  |
Prior | 90,980 |  |  |
Revolving Loans Amortized Cost Basis | 49,874 |  |  |
Loans | 364,520 |  | 186,180 |
Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 3,628 |  |  |
2019 | 9,991 |  |  |
2018 | 22,984 |  |  |
2017 | 16,960 |  |  |
2016 | 11,053 |  |  |
Prior | 43,798 |  |  |
Revolving Loans Amortized Cost Basis | 20,659 |  |  |
Loans | 129,073 |  | 80,346 |
Doubtful |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 89 |  |  |
2019 | 440 |  |  |
2018 | 586 |  |  |
2017 | 314 |  |  |
2016 | 360 |  |  |
Prior | 621 |  |  |
Revolving Loans Amortized Cost Basis | 740 |  |  |
Loans | 3,150 |  |  |
Commercial and industrial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 341,806 |  |  |
2019 | 189,148 |  |  |
2018 | 82,337 |  |  |
2017 | 64,787 |  |  |
2016 | 45,070 |  |  |
Prior | 46,542 |  |  |
Revolving Loans Amortized Cost Basis | 576,432 |  |  |
Loans | 1,346,122 |  | 1,034,036 | 867,083
Commercial and industrial | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 335,519 |  |  |
2019 | 183,905 |  |  |
2018 | 64,897 |  |  |
2017 | 56,598 |  |  |
2016 | 30,641 |  |  |
Prior | 40,964 |  |  |
Revolving Loans Amortized Cost Basis | 525,885 |  |  |
Loans | 1,238,409 |  |  |
Commercial and industrial | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 3,786 |  |  |
2019 | 2,555 |  |  |
2018 | 6,213 |  |  |
2017 | 3,764 |  |  |
2016 | 7,847 |  |  |
Prior | 4,301 |  |  |
Revolving Loans Amortized Cost Basis | 39,901 |  |  |
Loans | 68,367 |  |  |
Commercial and industrial | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 2,467 |  |  |
2019 | 2,688 |  |  |
2018 | 11,227 |  |  |
2017 | 4,403 |  |  |
2016 | 6,582 |  |  |
Prior | 1,277 |  |  |
Revolving Loans Amortized Cost Basis | 10,502 |  |  |
Loans | 39,146 |  |  |
Commercial and industrial | Doubtful |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 34 |  |  |
2019 | 0 |  |  |
2018 | 0 |  |  |
2017 | 22 |  |  |
2016 | 0 |  |  |
Prior | 0 |  |  |
Revolving Loans Amortized Cost Basis | 144 |  |  |
Loans | 200 |  |  |
Construction |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 462,757 |  |  |
2019 | 393,683 |  |  |
2018 | 91,865 |  |  |
2017 | 54,304 |  |  |
2016 | 41,636 |  |  |
Prior | 65,971 |  |  |
Revolving Loans Amortized Cost Basis | 112,004 |  |  |
Loans | 1,222,220 |  | 551,101 | 556,051
Construction | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 460,232 |  |  |
2019 | 387,759 |  |  |
2018 | 78,319 |  |  |
2017 | 40,777 |  |  |
2016 | 40,386 |  |  |
Prior | 59,344 |  |  |
Revolving Loans Amortized Cost Basis | 112,004 |  |  |
Loans | 1,178,821 |  |  |
Construction | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 1,952 |  |  |
2019 | 4,169 |  |  |
2018 | 10,368 |  |  |
2017 | 13,386 |  |  |
2016 | 1,250 |  |  |
Prior | 3,559 |  |  |
Revolving Loans Amortized Cost Basis | 0 |  |  |
Loans | 34,684 |  |  |
Construction | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 573 |  |  |
2019 | 1,755 |  |  |
2018 | 3,178 |  |  |
2017 | 129 |  |  |
2016 | 0 |  |  |
Prior | 3,068 |  |  |
Revolving Loans Amortized Cost Basis | 0 |  |  |
Loans | 8,703 |  |  |
Construction | Doubtful |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 0 |  |  |
2019 | 0 |  |  |
2018 | 0 |  |  |
2017 | 12 |  |  |
2016 | 0 |  |  |
Prior | 0 |  |  |
Revolving Loans Amortized Cost Basis | 0 |  |  |
Loans | 12 |  |  |
Residential real estate | 1-to-4 family mortgage |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 284,978 |  |  |
2019 | 179,968 |  |  |
2018 | 169,514 |  |  |
2017 | 163,957 |  |  |
2016 | 115,537 |  |  |
Prior | 175,316 |  |  |
Revolving Loans Amortized Cost Basis | 0 |  |  |
Loans | 1,089,270 |  | 710,454 | 555,815
Residential real estate | 1-to-4 family mortgage | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 282,747 |  |  |
2019 | 176,374 |  |  |
2018 | 159,036 |  |  |
2017 | 147,816 |  |  |
2016 | 107,911 |  |  |
Prior | 152,027 |  |  |
Revolving Loans Amortized Cost Basis | 0 |  |  |
Loans | 1,025,911 |  |  |
Residential real estate | 1-to-4 family mortgage | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 1,783 |  |  |
2019 | 2,166 |  |  |
2018 | 6,672 |  |  |
2017 | 10,668 |  |  |
2016 | 4,004 |  |  |
Prior | 13,889 |  |  |
Revolving Loans Amortized Cost Basis | 0 |  |  |
Loans | 39,182 |  |  |
Residential real estate | 1-to-4 family mortgage | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 448 |  |  |
2019 | 1,422 |  |  |
2018 | 3,787 |  |  |
2017 | 5,473 |  |  |
2016 | 3,418 |  |  |
Prior | 9,043 |  |  |
Revolving Loans Amortized Cost Basis | 0 |  |  |
Loans | 23,591 |  |  |
Residential real estate | 1-to-4 family mortgage | Doubtful |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 0 |  |  |
2019 | 6 |  |  |
2018 | 19 |  |  |
2017 | 0 |  |  |
2016 | 204 |  |  |
Prior | 357 |  |  |
Revolving Loans Amortized Cost Basis | 0 |  |  |
Loans | 586 |  |  |
Residential real estate | Residential line of credit |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 0 |  |  |
2019 | 0 |  |  |
2018 | 0 |  |  |
2017 | 0 |  |  |
2016 | 0 |  |  |
Prior | 0 |  |  |
Revolving Loans Amortized Cost Basis | 408,211 |  |  |
Loans | 408,211 |  | 221,530 | 190,480
Residential real estate | Residential line of credit | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 0 |  |  |
2019 | 0 |  |  |
2018 | 0 |  |  |
2017 | 0 |  |  |
2016 | 0 |  |  |
Prior | 0 |  |  |
Revolving Loans Amortized Cost Basis | 396,348 |  |  |
Loans | 396,348 |  |  |
Residential real estate | Residential line of credit | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 0 |  |  |
2019 | 0 |  |  |
2018 | 0 |  |  |
2017 | 0 |  |  |
2016 | 0 |  |  |
Prior | 0 |  |  |
Revolving Loans Amortized Cost Basis | 6,511 |  |  |
Loans | 6,511 |  |  |
Residential real estate | Residential line of credit | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 0 |  |  |
2019 | 0 |  |  |
2018 | 0 |  |  |
2017 | 0 |  |  |
2016 | 0 |  |  |
Prior | 0 |  |  |
Revolving Loans Amortized Cost Basis | 4,756 |  |  |
Loans | 4,756 |  |  |
Residential real estate | Residential line of credit | Doubtful |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 0 |  |  |
2019 | 0 |  |  |
2018 | 0 |  |  |
2017 | 0 |  |  |
2016 | 0 |  |  |
Prior | 0 |  |  |
Revolving Loans Amortized Cost Basis | 596 |  |  |
Loans | 596 |  |  |
Residential real estate | Multi-family mortgage |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 29,006 |  |  |
2019 | 13,446 |  |  |
2018 | 11,843 |  |  |
2017 | 46,561 |  |  |
2016 | 28,330 |  |  |
Prior | 35,396 |  |  |
Revolving Loans Amortized Cost Basis | 11,094 |  |  |
Loans | 175,676 |  | 69,429 | 75,457
Residential real estate | Multi-family mortgage | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 29,006 |  |  |
2019 | 13,446 |  |  |
2018 | 11,843 |  |  |
2017 | 46,561 |  |  |
2016 | 28,330 |  |  |
Prior | 35,339 |  |  |
Revolving Loans Amortized Cost Basis | 11,094 |  |  |
Loans | 175,619 |  |  |
Residential real estate | Multi-family mortgage | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 0 |  |  |
2019 | 0 |  |  |
2018 | 0 |  |  |
2017 | 0 |  |  |
2016 | 0 |  |  |
Prior | 0 |  |  |
Revolving Loans Amortized Cost Basis | 0 |  |  |
Loans | 0 |  |  |
Residential real estate | Multi-family mortgage | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 0 |  |  |
2019 | 0 |  |  |
2018 | 0 |  |  |
2017 | 0 |  |  |
2016 | 0 |  |  |
Prior | 57 |  |  |
Revolving Loans Amortized Cost Basis | 0 |  |  |
Loans | 57 |  |  |
Residential real estate | Multi-family mortgage | Doubtful |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 0 |  |  |
2019 | 0 |  |  |
2018 | 0 |  |  |
2017 | 0 |  |  |
2016 | 0 |  |  |
Prior | 0 |  |  |
Revolving Loans Amortized Cost Basis | 0 |  |  |
Loans | 0 |  |  |
Residential real estate | Non-owner occupied |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 166,962 |  |  |
2019 | 233,152 |  |  |
2018 | 350,814 |  |  |
2017 | 221,149 |  |  |
2016 | 290,370 |  |  |
Prior | 297,712 |  |  |
Revolving Loans Amortized Cost Basis | 38,820 |  |  |
Loans | 1,598,979 |  |  |
Residential real estate | Non-owner occupied | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 166,962 |  |  |
2019 | 222,238 |  |  |
2018 | 324,848 |  |  |
2017 | 193,496 |  |  |
2016 | 264,820 |  |  |
Prior | 237,933 |  |  |
Revolving Loans Amortized Cost Basis | 37,787 |  |  |
Loans | 1,448,084 |  |  |
Residential real estate | Non-owner occupied | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 0 |  |  |
2019 | 8,704 |  |  |
2018 | 24,464 |  |  |
2017 | 27,653 |  |  |
2016 | 25,550 |  |  |
Prior | 42,696 |  |  |
Revolving Loans Amortized Cost Basis | 1,033 |  |  |
Loans | 130,100 |  |  |
Residential real estate | Non-owner occupied | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 0 |  |  |
2019 | 2,210 |  |  |
2018 | 1,502 |  |  |
2017 | 0 |  |  |
2016 | 0 |  |  |
Prior | 17,083 |  |  |
Revolving Loans Amortized Cost Basis | 0 |  |  |
Loans | 20,795 |  |  |
Residential real estate | Non-owner occupied | Doubtful |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 0 |  |  |
2019 | 0 |  |  |
2018 | 0 |  |  |
2017 | 0 |  |  |
2016 | 0 |  |  |
Prior | 0 |  |  |
Revolving Loans Amortized Cost Basis | 0 |  |  |
Loans | 0 |  |  |
Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 141,915 |  |  |
2019 | 182,641 |  |  |
2018 | 104,251 |  |  |
2017 | 116,906 |  |  |
2016 | 82,914 |  |  |
Prior | 237,800 |  |  |
Revolving Loans Amortized Cost Basis | 58,414 |  |  |
Loans | 924,841 |  |  |
Commercial real estate | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 133,046 |  |  |
2019 | 174,965 |  |  |
2018 | 95,182 |  |  |
2017 | 89,214 |  |  |
2016 | 76,539 |  |  |
Prior | 208,013 |  |  |
Revolving Loans Amortized Cost Basis | 51,264 |  |  |
Loans | 828,223 |  |  |
Commercial real estate | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 8,825 |  |  |
2019 | 5,891 |  |  |
2018 | 6,646 |  |  |
2017 | 21,618 |  |  |
2016 | 6,101 |  |  |
Prior | 18,561 |  |  |
Revolving Loans Amortized Cost Basis | 2,417 |  |  |
Loans | 70,059 |  |  |
Commercial real estate | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 44 |  |  |
2019 | 1,785 |  |  |
2018 | 2,423 |  |  |
2017 | 6,074 |  |  |
2016 | 274 |  |  |
Prior | 11,226 |  |  |
Revolving Loans Amortized Cost Basis | 4,733 |  |  |
Loans | 26,559 |  |  |
Commercial real estate | Doubtful |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 0 |  |  |
2019 | 0 |  |  |
2018 | 0 |  |  |
2017 | 0 |  |  |
2016 | 0 |  |  |
Prior | 0 |  |  |
Revolving Loans Amortized Cost Basis | 0 |  |  |
Loans | 0 |  |  |
Commercial real estate | Non-owner occupied |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans | 1,598,979 |  | 920,744 | 700,248
Consumer and other |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 90,057 |  |  |
2019 | 54,201 |  |  |
2018 | 42,747 |  |  |
2017 | 28,830 |  |  |
2016 | 44,964 |  |  |
Prior | 41,345 |  |  |
Revolving Loans Amortized Cost Basis | 15,496 |  |  |
Loans | 317,640 |  | $ 272,078 | $ 228,853
Consumer and other | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 89,625 |  |  |
2019 | 52,725 |  |  |
2018 | 39,420 |  |  |
2017 | 26,172 |  |  |
2016 | 40,980 |  |  |
Prior | 31,063 |  |  |
Revolving Loans Amortized Cost Basis | 14,816 |  |  |
Loans | 294,801 |  |  |
Consumer and other | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 281 |  |  |
2019 | 911 |  |  |
2018 | 1,893 |  |  |
2017 | 1,497 |  |  |
2016 | 3,049 |  |  |
Prior | 7,974 |  |  |
Revolving Loans Amortized Cost Basis | 12 |  |  |
Loans | 15,617 |  |  |
Consumer and other | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 96 |  |  |
2019 | 131 |  |  |
2018 | 867 |  |  |
2017 | 881 |  |  |
2016 | 779 |  |  |
Prior | 2,044 |  |  |
Revolving Loans Amortized Cost Basis | 668 |  |  |
Loans | 5,466 |  |  |
Consumer and other | Doubtful |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
2020 | 55 |  |  |
2019 | 434 |  |  |
2018 | 567 |  |  |
2017 | 280 |  |  |
2016 | 156 |  |  |
Prior | 264 |  |  |
Revolving Loans Amortized Cost Basis | 0 |  |  |
Loans | $ 1,756 |  |  |

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- Definition Amount of financing receivable originated three years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919232-210447 + Details
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